SFI SYSTEM Starter Signal Circuit

DTC Code DTC Name
Starter Signal Circuit

DESCRIPTION

  • w/o Entry and Start System

  • While the engine is being cranked, current flows from terminal ST2 of the ignition or starter switch assembly to the neutral position switch*, TCM* and also flows to terminal STA of the ECM (STA Signal). The ECM uses the STA signal to control the fuel injection and ignition timing when the engine starts.

    *: for MMT models

  • w/ Entry and Start System

  • While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly) to neutral position switch*1 or clutch start switch assembly*2 and also flows to terminal STA of the ECM (STA signal).

    *1: for MMT models

    *2: for M/T models

WIRING DIAGRAM

A361134E01
A326919E01

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

  1. CHECK WHETHER ENGINE CAN BE CRANKED

    1. Check if the engine can be cranked.

      Result

      Result

      Proceed to

      Engine cannot be cranked

      A

      Engine can be cranked

      B
    B

    READ VALUE USING GTS (STARTER SIGNAL)Click here

    A

  2. READ VALUE USING GTS (STARTER SIGNAL)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK

      Ignition Switch Position

      Starter Signal

      ON

      OFF

      START

      ON

      Result

      Proceed to

      Proceed to

      OK

      A

      NG (w/o entry and start system)

      B

      NG (w/ entry and start system and for MMT models)

      C

      NG (w/ entry and start system and for M/T models)

      D
    B

    INSPECT IGNITION OR STARTER SWITCH ASSEMBLYClick here

    C

    INSPECT NEUTRAL POSITION SWITCHClick here

    D

    INSPECT CLUTCH START SWITCH ASSEMBLYClick here

    A

  3. INSPECT ST RELAY

    1. Inspect the ST relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ST RELAY

    OK

  4. INSPECT STARTER ASSEMBLY

    1. Inspect the starter assembly.

      w/ stop and start system:Click here

      w/o stop and start system:Click here

      Result

      Result

      Proceed to

      OK

      A

      NG (w/ stop and start system)

      B

      NG (w/o stop and start system)

      C
    B

    REPLACE STARTER ASSEMBLY

    Click here

    C

    REPLACE STARTER ASSEMBLY

    Click here

    A

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY)

    1. Remove the ST relay from the No. 1 engine room relay block.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      5 (ST relay) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BATTERY)

    OK

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER ASSEMBLY)

    1. Disconnect the starter assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      B24-1 - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER ASSEMBLY - BATTERY)

    OK

  7. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)

    1. Remove the ST relay from the No. 1 engine room relay block.

    2. Disconnect the starter assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 (ST relay) - B25-1

      Always

      Below 1 Ω

      3 (ST relay) or B25-1 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

    1. Remove the ST relay from the No. 1 engine room relay block.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (ST relay) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)

    1. Disconnect the ECM connector.

    2. Remove the ST relay from the No. 1 engine room relay block.

    3. Disconnect the ignition or starter switch assembly connector (for M/T models).

    4. Disconnect the A27 TCM connector (for MMT models).

    5. Disconnect the A24 engine stop and start ECU connector (w/ stop and start system).

    6. Disconnect the E50 certification ECU (smart key ECU assembly) connector (w/ entry and start system).

    7. Disconnect the A44 neutral position switch connector (w/ entry and start system and for MMT models).

    8. Disconnect the A19 clutch start switch assembly connector (w/ entry and start system and for M/T models).

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A34-46 (STA) - 2 (ST relay)

      Always

      Below 1 Ω

      A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

    1. Inspect the ignition or starter switch assembly.

      Click here

    Result

    Result

    Proceed to

    OK (for MMT models)

    A

    OK (for M/T models and w/ stop and start system)

    B

    OK (for M/T models and w/o stop and start system)

    C

    NG

    D
    B

    CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ENGINE STOP AND START ECU - ECM - ST RELAY)Click here

    C

    CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ECM - ST RELAY)Click here

    D

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

    Click here

    A

  11. INSPECT NEUTRAL POSITION SWITCH

    1. Inspect the neutral position switch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE NEUTRAL POSITION SWITCH

    Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - NEUTRAL POSITION SWITCH)

    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the neutral position switch connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E21-7 (ST2) - A44-2 (TMN)

      Always

      Below 1 Ω

      E21-7 (ST2) or A44-2 (TMN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - TCM)

    1. Disconnect the neutral position switch connector.

    2. Disconnect the TCM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A44-1 (TME) - A27-3 (TMN)

      Always

      Below 1 Ω

      A44-1 (TME) or A27-3 (TMN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR (TCM - ECM - ST RELAY)

    1. Disconnect the TCM connector.

    2. Disconnect the ECM connector.

    3. Remove the ST relay from the No. 1 engine room relay block.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A27-4 (STRL) - A34-46 (STA)

      Always

      Below 1 Ω

      A27-6 (STA), A27-4 (STRL), A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ENGINE STOP AND START ECU - ECM - ST RELAY)

    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the engine stop and start ECU connector.

    3. Disconnect the ECM connector.

    4. Remove the ST relay from the No. 1 engine room relay block.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E21-7 (ST2) - A34-46 (STA)

      Always

      Below 1 Ω

      E21-7 (ST2), A24-21 (STA), A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ECM - ST RELAY)

    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the ECM connector.

    3. Remove the ST relay from the No. 1 engine room relay block.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E21-7 (ST2) - A34-46 (STA)

      Always

      Below 1 Ω

      E21-7 (ST2), A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. INSPECT NEUTRAL POSITION SWITCH

    1. Inspect the neutral position switch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE NEUTRAL POSITION SWITCH

    Click here

    OK

  18. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NEUTRAL POSITION SWITCH)

    1. Disconnect the certification ECU (smart key ECU assembly) connector.

    2. Disconnect the neutral position switch connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E49-16 (STAR) - A44-2 (TMN)

      Always

      Below 1 Ω

      E49-16 (STAR) or A44-2 (TMN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - TCM - ECM - ST RELAY)

    1. Disconnect the neutral position switch connector.

    2. Disconnect the certification ECU (smart key ECU assembly) connector.

    3. Disconnect the TCM connector.

    4. Disconnect the ECM connector.

    5. Remove the ST relay from the No. 1 engine room relay block.

    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A44-1 (TME) - A34-46 (STA)

      Always

      Below 1 Ω

      A44-1 (TME), E50-37 (STA), A27-6 (STA), A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ENTRY AND START SYSTEM

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. INSPECT CLUTCH START SWITCH ASSEMBLY

    1. Inspect the clutch start switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY

    Click here

    OK

  21. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY)

    1. Disconnect the certification ECU (smart key ECU assembly) connector.

    2. Disconnect the clutch start switch assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E49-16 (STAR) - A19-2

      Always

      Below 1 Ω

      E49-16 (STAR) or A19-2 - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      Proceed to

      OK (w/ stop and start system)

      A

      OK (w/o stop and start system)

      B

      NG

      C
    B

    CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ECM - ST RELAY)Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  22. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ENGINE STOP AND START ECU - ECM - ST RELAY)

    1. Disconnect the clutch start switch assembly connector.

    2. Disconnect the engine stop and start ECU connector.

    3. Disconnect the ECM connector.

    4. Remove the ST relay from the No. 1 engine room relay block.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A19-1 - A34-46 (STA)

      Always

      Below 1 Ω

      A19-1, A24-21 (STA), A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ENTRY AND START SYSTEM

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  23. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ECM - ST RELAY)

    1. Disconnect the clutch start switch assembly connector.

    2. Disconnect the ECM connector.

    3. Remove the ST relay from the No. 1 engine room relay block.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A19-1 - A34-46 (STA)

      Always

      Below 1 Ω

      A19-1, A34-46 (STA) or 2 (ST relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ENTRY AND START SYSTEM

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  24. READ VALUE USING GTS (STARTER SIGNAL)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK

      Ignition Switch Position

      Starter Signal

      ON

      OFF

      START

      ON

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ST RELAY)